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14 inch

Four-Sheave-J-Block

Key to four sheave J-Block Model Numbers

J 15 Q 10 B T A
Shorty “J” Crane Block Safe Working Limit-Tons

Number of Sheaves

Q=4
Quadruple

Sheave Size – Nom. O.D.

Sheave Bearing:

B = Bronze Bushed
R= Roller Bearing

 Hook-Thrust Bearing

Cheek Weights:
A = No wts.
AB = Med. wts.
B = Std. wts.
C = X-Heavy wts.


Model WT. A B E F H J K
Overall Net Thick- Width Throat Opening Hook Hook



Length
Length
ness


w/ Latch
Thick.
Width
J-25Q14BTA 400 32 29 11.125 18 2.80 3.00 2.38
J-25Q14BTB 580 32 29 15.625 18 2.80 3.00 2.38
J-25Q14BTC 745 32 29 19.875 18 2.80 3.00 2.38
J-25Q14RTA 400 32 29 11.125 18 2.80 3.00 2.38
J-25Q14RTB 580 32 29 15.625 18 2.80 3.00 2.38
J-25Q14RTC 745 32 29 19.875 18 2.80 3.00 2.38
J-30Q14BTA 435 36 32.250 11.250 18 3.28 3.50 3.00
J-30Q14BTB 620 36 32.250 15.625 18 3.28 3.50 3.00
J-30Q14BTC 785 36 32.250 19.875 18 3.28 3.50 3.00
J-30Q14RTA 435 36 32.250 11.250 18 3.28 3.50 3.00
J-30Q14RTB 620 36 32.250 15.625 18 3.28 3.50 3.00
J-30Q14RTC 785 36 32.250 19.875 18 3.28 3.50 3.00
J-35Q14BTA 435 41.750 37.500 11.250 18 3.27 4.25 3.38
J-35Q14BTB 620 41.750 37.500 15.625 18 3.27 4.25 3.38
J-35Q14BTC 780 41.750 37.500 19.875 18 3.27 4.25 3.38
J-35Q14RTA 435 41.750 37.500 11.250 18 3.27 4.25 3.38
J-35Q14RTB 620 41.750 37.500 15.625 18 3.27 4.25 3.38
J-35Q14RTC 780 41.750 37.500 19.875 18 3.27 4.25 3.38
J-40Q14BTA 500 43.125 38.875 11.250 18 3.27 4.25 3.38
J-40Q14BTB 720 43.125 38.875 15.625 18 3.27 4.25 3.38
J-40Q14BTC 885 43.125 38.875 19.875 18 3.27 4.25 3.38
J-40Q14RTA 500 43.125 38.875 11.250 18 3.27 4.25 3.38
J-40Q14RTB 720 43.125 38.875 15.625 18 3.27 4.25 3.38
J-40Q14RTC 885 43.125 38.875 19.875 18 3.27 4.25 3.38
J-45Q14BTA 500 43.125 38.875 11.250 18 3.27 4.25 3.38
J-45Q14BTB 720 43.125 38.875 15.625 18 3.27 4.25 3.38
J-45Q14BTC 885 43.125 38.875 19.875 18 3.27 4.25 3.38
J-45Q14RTA 500 43.125 38.875 11.250 18 3.27 4.25 3.38
J-45Q14RTB 720 43.125 38.875 15.625 18 3.27 4.25 3.38
J-45Q14RTC 885 43.125 38.875 19.875 18 3.27 4.25 3.38


Dead End Chart

Wire Rope Size T U For Pin Size
7/16″ thru 5/8″ 1 1.28 1-1/4
3/4″ thru 1″ 1.25 1.65 1-5/8
1-1/8″ thru 1-3/8″ 1.75 2.51 2-1/2

*Gunnebo Johnson Design Factor is 4 to 1, with some exceptions;

45 Ton models 3.6 to 1

60 Ton models 3.7 to 1

325 Ton models 3.7 to 1